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🔍 PREVIEW MODE – Only you can see this. Back to Admin EduTek Lesson Notes Shop Print PDF Home › SS › Physics › Thermal Expansion SS 2 Thermal Expansion Physics SS 2 First Term Introduction to Thermal Expansion Thermal expansion is the increase in the size of a substance when its temperature increases. Most materials expand when heated and contract when cooled. 📌 Key Concepts: Thermal Expansion: The increase in volume or dimensions of a material due to an increase in temperature. Thermal Contract [Preview only]